Supported file formats: 

Free plan: mp3, m4a.

Unlimited Audio Plan: mp3, m4a, ogg, mpg, zip, pdf.

Unlimited Plus and above plans: mp3, m4a, ogg, mp4, m4v, zip, pdf, mpg.

Supported images formats: 

.jpg, .gif, and .png.


The recommended stereo bit rate and sample rate for audio files:

Stereo Bit Rate:  128 kbps

Sample Rate:  44.1 kHz 

The maximum allowed single file size3GB.
The maximum allowed single image file size1 MB.



In order to be better compatible with iTunes, iPad/tablets, and mobile, we highly recommend you use Mp3 or H.264 based mp4 and m4v.